@article{be81ee32-4071-47b3-910f-419a6a9a012e,
abstract = {The phase behavior of the three-component PEO-PPO-PEO/dextradwater system has<br/><br>
been studied. Pluronic L64, P105, and F68 were used, and they are members of a family of triblock<br/><br>
copolymers with the structure PEO-PPO-PEO, where PEO is poly(ethy1ene oxide) and PPO poly-<br/><br>
(propylene oxide). Moreover, these triblock copolymers tend to self-aggregate in aqueous solution at<br/><br>
increasing temperature. The phase behavior of the three-component system was studied both experi-<br/><br>
mentally and theoretically at different temperatures corresponding to the unimer (monomolecular) and<br/><br>
the micellar region of the PEO-PPO-PEO polymers. The determination of the unimer and micellar<br/><br>
regions was performed with a dye solubilization technique using 1,6-diphenyl-1,3,5-hexatriene (DPH) as<br/><br>
a spectroscopic probe. A strong temperature effect on the phase behavior in PEO-PPO-PEO/dextrad<br/><br>
water systems was observed in the case of Pluronic L64 and P105. At elevated temperature (40 "C) the<br/><br>
micellization of the PEO-PPO-PEO polymers leads to a drastic change of the tie-line slopes as well as<br/><br>
the shape of the binodals. Qualitative agreements were found between experimental findings and<br/><br>
theoretical calculations using a Flory-Huggins lattice theory extended with internal degrees of freedom<br/><br>
by modeling the PEO-PPO-PEO polymers as a poly(ethy1ene oxide) chain. This supports the prevailing<br/><br>
picture that the more hydrophobic PPO block is shielded from water contacts by forming hydrophobic<br/><br>
domains surrounded by EO segments.},
author = {Svensson, Mårten and Linse, Per and Tjerneld, Folke},
issn = {0024-9297},
keyword = {OXIDE) TRIBLOCK COPOLYMER,OXYPROPYLENE OXYETHYLENE),LIGHT-SCATTERING,PROPYLENE-OXIDE,ETHYLENE-OXIDE,MICELLIZATION,SOLUBILIZATION,ASSOCIATION,PROBE},
language = {eng},
number = {10},
pages = {3597--3603},
publisher = {The American Chemical Society},
series = {Macromolecules},
title = {Phase Behavior in Aqueous Two-Phase Systems Containing},
url = {http://dx.doi.org/10.1021/ma00114a012},
volume = {28},
year = {1995},
}